Missmatch between mbr and gpt

Hello,
I just finished downloading the updates yosemite in the app store.
when I tried to start the installation, the installation was issued a message like this
"Can't Install OS X on your Computer
a missmatch between the mbr and gpt partition maps is not supported with this operation.
Quit the installer to restart your computer and try again"
what should i do? i have 2 boot .
1 boot mac , and 1 bootcamp windows 7
sorry I am still learning in installing yosemite
My macbook pro version is
Macbook Pro 13" , Mid 2010 .
Thanks before,
Masrai

What is the version of OS on your Mac that you are currently using?
Open Disk Utility app, and from the sidebar on the left hand side select your physical drive (usually top entry on the sidebar). Then look at the bottom of this window and look for option called Partition Map Scheme. What does it say on your Mac?

Similar Messages

Partition Table Looks Different Between OSX and Windows 7

Hey all,
I recently replaced the hard drive on my 2007 iMac, going from the 320GB drive to a 1 TB drive. It actually worked! The previous drive was failing in very odd ways, though booting into the Windows side (more on dual boot later) always seemed to work, and S.M.A.R.T. always reported that the physical drive seemed OK.
The previous drive (320 GB) had around 200GB devoted to OSX and 100GB partitioned off for a working Windows 7 installation (custom installed x64 Win7 Ultimate). I had the Windows system image backed up to my NAS, and had a Windows system bootable disc to restore that image.
After replacing the drive (and almost crying that I had actually done it right), I first restored OSX from a Time Machine backup, and let it take the full 1TB of space as Journalled HFS+. Then, I used Disk Utility to shrink OSX down to 500GB, and created a second partition (formatted to NTFS) with the remaining 500GB.
Now, restoring a Windows system image is an odd thing, as it tries to do a lot of partition work as opposed to simply restoring the Windows install to a partition. I tried Macrium Reflect first (made a backup in that, too), and it looked like it was going to let me restore to the second partition. It completed the restore...and the entire hard drive was hosed. Partitions had been moved, renamed, resized, and nothing was bootable. I had to use Recovery from an external USB thumb drive to go back to the single, full-drive install of OSX.
Then I tried again. Made the second NTFS partition and used the basic Windows System Restore disk to restore from the standard system image I had on the NAS. I was not expecting this to work. But it did. Windows started showing up in Startup Manager when "option" was pressed on bootup, and both OSX and Windows booted properly and ran fine. This is where I (finally) get to the supreme oddities:
OSX Disk Utility still reports two 500GB partitions, one for OSX and one for Windows.
In OSX the Windows partition shows as having NO DATA on it. Not sure what would happen if I tried to write a file to it when mounted, but there is no data on it when viewed from OSX (I was always able to see the Windows files when I mounted that partition on the previous drive).
The Windows partition does not show up as a valid bootable system in System Prefs --> Startup Disk (naturally, I suppose, since OSX doesn't think there is anything there).
From the WINDOWS side, Windows still sees the old partition table: 200GB for the "unknown" HFS partition, and then the rest of the space can be devoted to Windows (started as 100GB, but I was ablt to expand it to use the remaining ~750GB!). Windows thinks it can have 750GB of space even though I know its partition is only 500GB in size!
Windows cannot see the OSX HFS partition data using HFSExplorer. It CAN see the HFS partition on the attached backup drive (the drive I use for Time Machine).
GParted (a partition program on a Linux bootabld CD-ROM) shows the same partitions as OSX Disk Utility (2x500GB), and also thinks the Windows NTFS partition is empty (all space reports as "unused").
Did I mention both OSX and Windows work fine???
There are, of course, two other partitions on the drive: the first partition is the 200MB one I always see (EFI/GUID portion?), and then between the HFS and NTFS partitions is the 600MB recovery partition (which also shows at option-pressed boot time). OSX, GParted, and Windows see all four partitions, and in the same order. It is just that Windows sees the wrong sizes, and OSX cannot see any data in the Windows partition.
Surely this is all going to break spectacularly at some point, isn't it? What if I ever did write a file to the Windows side from OSX, or what if OSX starts taking more space than the 200GB Windows thinks is the max for that partition? What if I try to make Windows use more than 500GB because it thinks it has almost 800GB to use? What if I defrag the Windows drive?
I had no idea a partition table could look this goofy and yet still have everything be bootable and workable. Is there something I can do to get everything in sync? Basically, I am assuming I need to get Windows to do some low-level kung fu in Disk Manager in order to properly get everything lined up with the "right" partitions as reported by both GParted and OSX Disk Utility. But how do I do that?
By the way, any ideas that totally nuke the drive and start from scratch are completely fine (if it seems like they are doing something different enough that I'd give it a try). I have good backups of both OSX and Windows and have restored them about a half dozen times already as I dealt with the previous failing hard drive and with trying to get dual-boot working again. Not to mention, this iMac is now my secondary machine to the new Mac Mini I got a couple weeks back when I wasn't sure how much more life I was going to get from this 6+ year old iMac.
Thanks for listening to me ramble about this very odd issue, and a huge THANK YOU in advance to anyone who has ideas to help.
Thanks,
sutekh138

Update:
I am pretty sure the issue is a simple GPT/MBR discrepancy.
I installed rEFIt and used it's partitioning tool (gptsync built in) upon bootup. It was able to show the GPT table and the MBR table, but it thinks the second partition of the drive (the Mac OSX bootable partition) is "extended" in the MBR table and says "will not touch this disk."
However, it does look like an MBR sync should be straightforward, as there four partitions in the GPT table and four in the MBR (and MBR allows a max of four, AFAIK). I just need gptsync to relax some rules. I found a link to a supposedly newer version of gptsync compiled for OSX, so I will try that later.
First, I will try Partition Wizard, a free tool I found for the Windows side. It has a "Repair MBR" option that I would have tried last night if I weren't running a new Windows Image Backup in case all of this goes haywire. *smile* The PW tool also has an option to change the MBR over to GPT entirely. That might work, but then I am not sure Windows 7 will boot (from what I read, x64 Win7 running on EFI-enabled hardware should work, but who knows).
Anyway, I will try the following things, in order, until something works, when I get home tonight:
From Windows, run Partition Wizard and try "Repair MBR".
From OSX, download recent gptsync and try to run it.
From Windows, use Partition Wizard to do a full MBR --> GPT conversion.
Nuke the Windows partition in OSX Disk Utility, expand the HFS partition to take up the whole drive, and then add a Windows-bootable partition via Boot Camp-ish command line commands (diskutil). Because if nothing else works, I have to assume I just created the partitions wrong in the first place such that a Windows restore miraculously works, but the partition weirdness is just a timebomb waiting to happen.
Finally, if none of the above work, I'll just get things back to the way they now work and wait for the timebomb to (possibly never) go off. *smile*
I'll update this thread if I get something figured out, in case anyone else stumbles upon it...
Thanks,
sutekh138

G500 change MBR to GPT for win8 Install without deleting the oem partition

Hi, I just bought Lenovo g500 and it came with Free DOS. Now I want to install windows 8 64-bit.
My HDD came with:
1 system partition of 1000 MB (maybe Free DOS partition?)
959 518 MB Unallocated space
1000 MB OEM - reserved partition
It has MBR partition table. To install windows 8 64-bit I need to use UEFI boot with GPT partition table, so I need to convert the MBR table to GPT. Microsoft suggest to delete all partitions and convert to GPT using Diskart command, but if I delete all partitions I will lose the 1000 MB OEM partition (and oneKey recovery)
Is there any solution on how to convert to GPT without losing the OEM partition? or I have to choose between win8 and OEM partition.

Hi Gicevgoran,
Welcome to Lenovo Community Forums
I’m sorry to inform you that installing the Windows 8 is not possible without making changes in the default partition created in the computer while the pre-installed OS (Operating System) was installed, I suggest you to create a Recovery discs in your computer and then make changes so that you can revert back anytime if you require, below is the link to download the User Guide for G500 Laptop and refer page no. 21 for the steps to create the Recovery Discs for the computer.
User Guide for Lenovo G500
Do post us back for further queries.
Best Regards
Shiva Kumar
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Dual boot Arch / Windows 8 with grub, uefi and gpt

hi,
(my aplogies for my bad english)
after a fresh installation without worries I have one last problem : starting w8
Partitions :
[root@ToshCM christian]# gdisk -l /dev/sda
GPT fdisk (gdisk) version 0.8.7
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 1465149168 sectors, 698.6 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): BAE3660C-FC6F-11E1-9C45-C6B1BB081CD7
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1465149134
Partitions will be aligned on 2048-sector boundaries
Total free space is 3757 sectors (1.8 MiB)
Number Start (sector) End (sector) Size Code Name
1 2048 923647 450.0 MiB 2700 Basic data partition
2 923648 1456127 260.0 MiB EF00 Basic data partition
3 1456128 1718271 128.0 MiB 0C01 Basic data partition
4 1718272 1230518271 585.9 GiB 0700 Basic data partition
5 1445343232 1465147391 9.4 GiB 2700 Basic data partition
6 1230518272 1250998271 9.8 GiB 8200
7 1250998272 1291958271 19.5 GiB 8300
8 1291958272 1445343231 73.1 GiB 8300
2 = efi (fat32)
4 = Windows (ntfs)
6 = swap
7 = /
8 = /home
EFI partition is mounted in /boot/efi
[root@ToshCM christian]# grep efi /etc/fstab
UUID=7CD3-EE8E /boot/efi vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 2
For now I have a grub that works perfectly without Windows
Now I try to follow this page
[root@ToshCM christian]# grub-probe --target=fs_uuid /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi
7CD3-EE8E
[root@ToshCM christian]# grub-probe --target=hints_string /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi
--hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2
I put the result in /etc//grub.d/40_custom
[root@ToshCM christian]# cat /etc/grub.d/40_custom
#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry "Microsoft Windows Vista/7/8 x86_64 UEFI-GPT" {
insmod part_gpt
insmod fat
insmod search_fs_uuid
insmod chain
search --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 7CD3-EE8E
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
I regenerates grub.cfg
grub-mkconfig -o /boot/grub/grub.cfg
I check the result in /boot/grub/grub.cfg
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry "Microsoft Windows Vista/7/8 x86_64 UEFI-GPT" {
insmod part_gpt
insmod fat
insmod search_fs_uuid
insmod chain
search --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 7CD3-EE8E
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
### END /etc/grub.d/40_custom ###
After reboot I can see a fine line with Windows but it has no effect, neither start nor error message
The computer is a Toshiba Satellite C855-1TM
In the BIOS Advanced page "Boot Mode" is [UEFI Boot]
In the Security page "Secure Boot" is [Disabled]
Thanks in advance

vintherine wrote:
the.ridikulus.rat wrote:
@vintherine: Everything you mentioned in the 1st post is correct. In your case the correct commands should be:
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=arch_grub --recheck
grub-mkconfig -o /boot/grub/grub.cfg
Thanks. I've tried that, get now a single line with Windows, which does not work
EDIT: Are you able to boot Windows independent of GRUB, ie. directly from the firmware boot menu?
I've tried F12 key, found a menu, started on the HD, found a new menu corresponding with the EFI directories (arch_grub, Microsoft....). Microsoft entry sent me on... grub menu
EDIT: Can you try (note the extra line : "set gfxpayload=keep")
It's time for diner (i'm in France). I'll see this in the next hour.
Many thanks
Seems like the actual Windows bootmgfw.efi was overwritten by grubx64.efi or something else. In the boot menu Windows's entry (created by Windows installer) is usually titled "Windows Boot Manager".
EDIT:
Try this. Copy the files from Windows's C:\Windows\Boot\EFI to <EFISYS>/EFI/Microsoft/Boot/ . Overwrite any exisitng files, and make sure <EFISYS>/EFI/Microsoft/Boot/BCD file exists. That is the Windows equivalent of grub.cfg (although BCD cannot be read easily since it is not a text file). Try your menuentry again.
Last edited by the.ridikulus.rat (2013-09-27 18:29:09)

Does Microsoft support disks which have been converted from MBR to GPT with third-party tools?

Before opening a ticket with Microsoft to get the official response, does Microsoft support disks which have been converted from MBR to GPT with third-party tools?
We have various disks on Windows Server 2008 R2 fileserver cluster that are all MBR with various mount points added to overcome the 2TB limitation on MBR disks. Due to the time involved in physically moving the 30Tb+ of data to GPT disks, I would
like to investigate the option of a lossless conversion tool. Does anybody have any experience of these in production environments that could comment?
Any advice and details of experiences would be really appreciated!
CRM Advisor

Hi,
Besed on my research, Microsoft supports a fileserver cluster if the disks have been converted from MBR to GPT using a third-party tool.
For more detailed information, please refer to the links below:
Convert MBR to GPT
https://social.technet.microsoft.com/Forums/en-US/3007346f-cf7b-4089-9628-36d394da8240/convert-mbr-to-gpt
Change a Master Boot Record Disk into a GUID Partition Table Disk
http://technet.microsoft.com/en-us/library/cc725671.aspx
Best Regards,
Mandy
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How can I fix a corrupt ssd mbr or gpt

I have a Runcore 64gb mini pci-e SSD with a USB cable. It is not new but used little. I wanted to make it bootable as a usb device but may have hosed it. What I did: (sorry, this is long)
Set up a single guid partition, and sucsessfully made a 63gb partition.
Then I used "erase free space" on the partition.
Here's where I screwed up. I decided to start over and "secure erased" the drive, not the partition I created, but the whole drive. That was a bone head mistake.
Well, after that, I could not change the partition and the root drive shows it's 2tb. disk repair says it's good. Funny thing is, I could still see the partition but not repartition.
I even used Carbon Copy Cloner to put 10.6.7 on the partition. It worked, I could boot to it. But it still won't let me change anything. I kept trying different erase options and continued to say it could't complete the task--until the last time I tried it. Now I can't see the partition. I still see the drive in disk util but can't do anything with it. It shows the same way on a Windows7 machine (2.2 tb).
After a lot of googling, It seems I have a corrupted MBR but the GPT part that Mac uses was ok...or used to be. Sometimes the drive shows "0" capacity, sometime 2.2tb. Last night I had dreams about MBR's GRUBs and GPTs. Today, in terminal, I typed "diskutil list" and got: identifier disk2, size 30.5gb (which is the size of the CCC drive I cloned), and the partition name that I originally made which was 63gb.
All I want to do is clean it off and start over. I don't care about the data. Any Advice? I would like to try something before tossing it. I'm totally willing to try anything since there is no critical data on it.
If you read all of this, thank you!

Can anyone at least point me in the right direction? perhaps I posted in the wrong area.

Determine if Windows 7 SP1 64-bit is installed on a MBR or GPT system partition

Hi
With Windows 7 SP1 64-bit, how do I determine if it is installed on a MBR or GPT system partition?
Thanks
Bye
Balubeto

Open Control Panel, then Device Manager, then expand the Disk Drives, right click on the disk drive and select Properties, select the Volumes tab, click on Populate and read the information displayed.
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”

[solved] MBR to GPT, GRUB2, load Funtoo

cgdisk 0.8.5
Disk Drive: /dev/sda
Size: 312315562, 148.9 GiB
Part. # Size Partition Type Partition Name
14.5 KiB free space
1 235.3 MiB Linux filesystem Linux filesystem
2 972.7 MiB Linux swap Linux swap
3 147.7 GiB Linux filesystem Linux filesystem
5.8 MiB free space
Dear Archers
I want to convertmy existing MBR to GPT, and then load GRUB2 for installing Funtoo on this same HDD. ArchWiki says leave 2MiB for EF02 GPT-BIOS partition, before /boot (/dev/sda1). But, I have only 14.5KB in this position. But I have 5MB in the end. Can I use this 5MB for EFI02 partition?
It is said I should do this before I convert MBR to GPT. I have not yet converted MBR to GPT. Pl. advise. If there are other pitfalls in this subject matter (including Funtoo install) advice appreciated
Last edited by San2ban (2012-06-27 07:57:58)

Went ahead (since no further inputs from any body), converted the last 5.8MB on the disk to bios-boot partition (before converting MBR to GPT), without file system, label EF082 (bios-boot partition)
Later, installed GRUB2-bios, in the 440 byte boot code region of MBR, as recommended by Archwiki. Now, system is with GPT partition (BIOS, not UEFI), boot loader is GRUB2. Now, free from the limitation of only 4 primary partition (with MBR)

Does Boot Camp use Hybrid MBR, and if so is there a way to avoid it?

The title pretty much says it all, folks. I don't know how to tell if it does or not, except that certain Windows applications will not perform everything they should because they say I'm running on a dynamic disk.
So... when I use the automated utility to set up boot camp, does it partition my drive to be a hybrid MBR, and if so is there another way to do it? I am one of those people who will avoid hybrid MBR like the plague, and I know that Windows 7 will boot from a GPT disk. I also know that the bootcamp assistant isn't necessarily needed for dual booting (it's just nice and easy!).
Thoughts?

EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 is a Windows or Linux data partition.
48465300-0000-11AA-AA11-00306543ECAC is an HFS+ partition.
C12A7328-F81F-11D2-BA4B-00A0C93EC93B is the EFI boot partition.
My first thought was also that it must've been Windows' fault, but could anything from a different system really cause OSX to corrupt itself almost EVERY time it boots (as in... without even touching the Win7 partition)?
Software-partitioned disks depend entirely on correct implementations and the full cooperation among the operating systems. Any corruption-level mistake in any operating system, in a privileged application within any of the operating systems, or within the EFI console, can mean the disk is toast.
To get the whole disk erased, you have to select and erase the whole disk, and not any of the partitions. This isn't necessarily obvious in Disk Utility, particularly given that tool doesn't show "hidden" partitions. (You can't see the EFI partition, for instance.)
There are all sorts of odd games software can play with disks, including (depending on the particular disks) hiding ranges of sectors, or "repurposing" gaps among the partitions, or "repurposing" otherwise unspecified parts within the MBR.
That Tuxera NTFS is certainly a reasonable potential suspect. That's a privileged application that's writing directly into the disk structures, and those can corrupt the context of another operating system sharing the disk. (Microsoft Windows had one of these with their "harmless signature" offer for some years; a sequence that effectively corrupted other operating systems on other disks in the server.) In this case, the particular NTFS tool deliberately accesses other partitions, so that intentionally breaks through to the other partitions, which makes it a candidate for corruptions.
Ensure you're on a current version of that tool, as a start, and see if the vendor has any reports of issues.

How can I covert a MBR to GPT partition map?

Mi imac don't restart after the 10.8.4 update, and the solution is reinstall OSX restoring the HD.
i'm using a external hard drive to clone the content of my HD, but its a MBR partition map, and it says that the process can only be done with a GPT partition map.
anyone who knows how to convert from a MBR to a GPT with a mac?
after converting the external HD, may i change again the partition map to his native MBR partition?
Many thanks.

Drive Partition and Format
1. Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
You can change the drive back to MBR by repartitioning it once again. Change GUID to MBR and the format to MSDOS on the Mac or do the same on a PC.

Solaris Install overwrote MBR and first partition

I have an ABIT mobo with VIA chipset and a Sempron 2500 CPU, and WD 120 GB SATA drive. Not top of the line, but I'm on a budget. I have the SATA partitioned for multibooting, and I use XOSL multibooter. I have 3 OS's already, and several other partitions for backup. I was planning on installing Solaris on another extended partition. Kinda slow... kinda slow... hard to see the text on the monitor. Oh, the unofficial installation instructions says I should already have the partition set up, and recommends I use Ranish Partition Manager. Ranish is my favorite PM, so I quit the install, reboot to DOS, and set up a partition with Ranish. Hmmm. Solaris isn't a file type. What to do, what to do. Later in the installation instructions, it talks about the installer partioning the hard drive, so maybe I don't have to do it here. I'l leave this partition as FAT32, maybe Solaris will convert it, or I can use it for another backup, or data, or another OS. I exit and reboot to the install. Kinda slow, kind slow... now I don't see the dark text at all. Hmmm, reboot, restart. I get past the first few screens, but then it's just blank. I kick out the disk and reboot to .... nothing. now it won't boot to the hard drive. I reboot from floppy, the hard drive isn't there. Hmmm. Back to Ranish. The first partition (FreeDOS) has no data files in it, and is the wrong size, extending into the second partition space. The second partition isn't there, and there is unused space between the first and third partitions. Exit Ranish and go into PTS Disk Editor. Luckily I wrote down the hex code for the partition table, so I fix it back the way it should be. What was Solaris doing overwriting my MBR and partition table? I hadn't gotten to that point in the install yet to set up a new partition. Reboot, still nothing. Restore the MBR (I saved that too, plus the 62 sectors following). Reboot. Still nothing. Oh yeah, my FAT from partition 1 is gone, and who knows what else. What was Solaris doing overwriting that partition? Back to Ranish. Set partition 2 (Windows 2000) as my boot partition. Reboot. Phew! At least that comes up. I'm not too happy with Solaris trashing my MBR, partition table, and first partition. Yeah, yeah yeah, it won't be too hard to restore it. I'll assume my Linux is still working, although I haven't tried it yet. I think I'll wait to install Solaris until after I have a new, clean disk, and I'll be sure to disconnect this one until after the install is complete. Sorry Sun, your once-solid reputation has bounced down a few steps on this one.

this post on ranish.com does confirm that solaris overwrites the MBR. Please let me know what u did to overcome the problem because i want to install Solaris on a hard drive partition with XP on the other partition. Thanks,
Utpal
Can I boot Solaris 9?
=====================
Yes. You can. But you need to keep the following in mind:
1. Don't use the 'Installation CD'. It is not required. You might have problems if you
use this CD. Start with Software CD1.
2.If your software installation/booting fails with ACPI error, follow the instructions at:
http://access1.sun.com/FAQSets/Solarisx86FAQs.html (Q12)
(I did not get this error)
3. After installing CD1, you need to boot from the harddisk (solaris 9 would have overwritten
your MBR � Don't worry about this now; just proceed with the installation). Once it is booted
off the disk, after going thru few initializations again, it will prompt you to insert the second CD.
Insert CD2 and complete the installation.
4. Now, you can restore the RPM MBR.

Difference between Null and null?

What is the difference between null and NULL?
When is each used?
Thanks,

veryConfused wrote:
There is a null in java, but no NULL. null means no value. However, when assigning value, the following is different:Although the empty String has no special role. Null means, the referential type is not assigned (doesn't refer) to a specific object. The empty String is just another object though, so seeing it or pointing it out as something special when it actually isn't at all (no more special than new Integer(0) or new Object[0]) just adds to the confusion.

7344 servo motion switching between open and closed loop operation

I have a custom end-of-line test system presently using a 4-axis 7344 servo controller to perform various functional tests on small, brushed DC motors. The system is programmed in C/C++ and uses flex motion functions to control the motor during testing. Motors are coupled to external encoder feedback and third party PWM drives running in closed-loop torque mode from an analog command signal. The system uses all four motion axis channels on the 7344 board to independently and asynchronously test up to four production motors at a time.
In closed-loop mode, the system runs without issue, satisfying the battery of testing protocols executed by this system. I now have a request to add additional test functionality to the system. This testing must be run in open loop mode. Specifically, I need to use my +/- 10v analog output command to my torque drive to send different DAC output levels to the connected motor.drive while monitoring response.
I do not believe the flex motion library or 7344 controller includes functions to easily switch between open and closed loop mode without sending a new drive configuration. I am also under the impression that I cannot reconfigure one (or more) servo controller axis channels without disabling the entire drive. As my system runs each axis channel in an asynchronous manner, any requirement to shutdown all drives each time I change modes is an unworkable solution.
I am open to all ideas that will allow asynchronous operation of my 4 motor testing stations. If the only solution is to add a second 7344 controller and mechanical relays to switch the drive and motor wiring between two separately configured servo channels, so be it. I just want to explore any available avenue before I place a price tag on this new system requirement.
Bob

Jochen,
Thank you for the quick response. The 7344 board does an excellent job running my manufacturing motor assemblies through a custom end-of-line tester in closed loop mode. A portion of the performance history and test result couples the motor through a mechanical load and external shaft. The shaft is in contact with a linear encoder that closes my servo loop.
My new manufacturing requirement is to also sample/document how the small DC motor behaves in open loop operation. Your solution is exactly what I need to perform the additional functional tests on the product I am manufacturing. I see no reason why this cannot work. I was originally concerned that I would need to reinitialize the 7344 board after changing axis configuration. Initialization is a global event and impacts all four channels on the 7344 board.
Using flex_config_axis() to change axis configuration on a single channel without disturbing other potentially running axis channels will solve my concern. It will be several weeks before I can return to the manufacturing facility where the 7344-based testing machine is located. I will update this thread once I verify a successful result.
Bob

Differentiating between open and closed invoices

Hi all
I am using a database view of tables VBRK and VRKPA for fetching invoice list based on the customer number. Can I use 'VBRK-RFBSK = C' to differentiate between closed and open invoices? If not is there any other field i can use from this particular view for the same.
Thanks

Hi Asim,
Yes, you are absolutely right. This field give you the exact result like which billing dcoument is open and which is closed.
Regards,
MT

Link between Delivery and Sales Order Schedule Line

Hi Gurus,
I have a requirement in which i need to display quantity and amount at schedule line level and also the delivery and delivery item for each schedule line.
For example, if there is a sales order O1 and item 10 for which we have 3 schedule lines and 3 deliveries as well say D1, D2 and D3.
Report should be something like this
Sales Order    Item   Schedule Line    Delivery    Del Item   Confirmed Order Qty
O1                 10      1                       D1           10            5
O1                 10       2                      D2            10            5
O1                 10       3                      D3            10            4
How can i determine that a particular delivery corresponds to which schedule line of that saler order-item?
We have the link between delivery and sales order but is there any way that we can get the link of delivery at schedule line level?
Please help.
Regards,
Gaurav

Hi,
I suppose you must check with SD functional consultant and the post should also be in the logistics SD forum and not BI. But I suppose there is know specific link between the schedule line of SO to the Delivery. It is more like a bucket flow for ex.
Sale order   Item    Schedule line qty
SO1            Item1     Sch1            10
SO2            Item1      Sch2           10
Delivery Item QTy
DO1       IT1   15
DO2       IT1    5
In this case qty 15 is distributed over both SO1 and SO2, and SO2 ITem1 Sch2 has link to both the DOs
So I am not sure if you can establish a one to one link, please check with your SD consultants.
Regards,
Ashwin G

Missmatch between mbr and gpt

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